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Commit dc4ddb4c authored by Frederic Weisbecker's avatar Frederic Weisbecker
Browse files

tracing: Add fields format definition for syscall events 



Define the format of the syscall trace fields to parse the binary
values from a raw trace using the syscall events "format" file.

This is defined dynamically using the syscalls metadata.
It prepares the export of syscall event raw records to perf
counters.

Example:

$ cat /debug/tracing/events/syscalls/sys_enter_sched_getparam/format
name: sys_enter_sched_getparam
ID: 39
format:
	field:unsigned short common_type;	offset:0;	size:2;
	field:unsigned char common_flags;	offset:2;	size:1;
	field:unsigned char common_preempt_count;	offset:3;	size:1;
	field:int common_pid;	offset:4;	size:4;
	field:int common_tgid;	offset:8;	size:4;

	field:pid_t pid;	offset:12;	size:8;
	field:struct sched_param * param;	offset:20;	size:8;

print fmt: "pid: 0x%08lx, param: 0x%08lx", ((unsigned long)(REC->pid)), ((unsigned long)(REC->param))

Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Jiaying Zhang <jiayingz@google.com>
Cc: Martin Bligh <mbligh@google.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Jason Baron <jbaron@redhat.com>
parent e8f9f4d7

include/linux/syscalls.h

+1 −0
Original line number Diff line number Diff line
@@ -189,6 +189,7 @@ static void prof_sysexit_disable_##sname(struct ftrace_event_call *event_call) \ 
		.system                 = "syscalls",			\

		.event                  = &event_syscall_enter,		\

		.raw_init		= init_enter_##sname,		\

		.show_format		= ftrace_format_syscall,	\

		.regfunc		= reg_event_syscall_enter,	\

		.unregfunc		= unreg_event_syscall_enter,	\

		.data			= "sys"#sname,			\

include/trace/syscall.h

+2 −0
Original line number Diff line number Diff line
@@ -55,6 +55,8 @@ extern int reg_event_syscall_enter(void *ptr); 
extern void unreg_event_syscall_enter(void *ptr);

extern int reg_event_syscall_exit(void *ptr);

extern void unreg_event_syscall_exit(void *ptr);

extern int

ftrace_format_syscall(struct ftrace_event_call *call, struct trace_seq *s);

enum print_line_t print_syscall_enter(struct trace_iterator *iter, int flags);

enum print_line_t print_syscall_exit(struct trace_iterator *iter, int flags);

#endif

kernel/trace/trace_syscalls.c

+46 −0
Original line number Diff line number Diff line
@@ -105,6 +105,52 @@ print_syscall_exit(struct trace_iterator *iter, int flags) 
	return TRACE_TYPE_HANDLED;

}



int ftrace_format_syscall(struct ftrace_event_call *call, struct trace_seq *s)

{

	int i;

	int nr;

	int ret = 0;

	struct syscall_metadata *entry;

	int offset = sizeof(struct trace_entry);



	nr = syscall_name_to_nr((char *)call->data);

	entry = syscall_nr_to_meta(nr);



	if (!entry)

		return ret;



	for (i = 0; i < entry->nb_args; i++) {

		ret = trace_seq_printf(s, "\tfield:%s %s;", entry->types[i],

				        entry->args[i]);

		if (!ret)

			return 0;

		ret = trace_seq_printf(s, "\toffset:%d;\tsize:%lu;\n", offset,

				       sizeof(unsigned long));

		if (!ret)

			return 0;

		offset += sizeof(unsigned long);

	}



	trace_seq_printf(s, "\nprint fmt: \"");

	for (i = 0; i < entry->nb_args; i++) {

		ret = trace_seq_printf(s, "%s: 0x%%0%lulx%s", entry->args[i],

				        sizeof(unsigned long),

					i == entry->nb_args - 1 ? "\", " : ", ");

		if (!ret)

			return 0;

	}



	for (i = 0; i < entry->nb_args; i++) {

		ret = trace_seq_printf(s, "((unsigned long)(REC->%s))%s",

				        entry->args[i],

					i == entry->nb_args - 1 ? "\n" : ", ");

		if (!ret)

			return 0;

	}



	return ret;

}



void ftrace_syscall_enter(struct pt_regs *regs, long id)

{

	struct syscall_trace_enter *entry;